Prof. Alexandra Guedes

University of Porto, Portuga



2001 Doctorate degree in Geology, University of Porto, Portugal

1992 Degree in Geology, Faculty of Sciences, University of Porto, Portugal

Publications (Selected)

  1. Pinto, T., Fernandes, D. M., Pereira, C., Guedes, A., Blanco, G., Pintado, J., Pereira, M. F., Freire, C. 2015. Lanthanophosphomolybdate-decorated silica nanoparticles: novel hybrid materials with photochromic properties. Dalton Transactions 44, 10, 4582-4593.
  2. Guedes, A., Ribeiro, H., Fernández-González, M., Aira, M.J., Abreu, I. 2014. Pollen Raman spectra database: application to the identification of airborne pollen. Talanta. 119, 473–478.
  3. Fernandes, C., Pereira,C., Guedes, A.,  Rebelo, S. L. H., Freire, C. 2014. Gold nanoparticles decorated on Bingel-thiol functionalized multiwall carbon nanotubes as an efficient and robust catalyst. Applied Catalysis A: General. Volume 486, 22 150–158.
  4. Fernandes, C., Pereira, C, Fernández-García, M.P., Pereira, A.M., Guedes, A., Fernández-Pacheco, R., Ibarra, A., Ibarra, M.R., Araújo, J.P., Freire, C. 2014. Tailored design of CoxMn1-xFe2O4 nanoferrites: a new route for dual control of size and magnetic properties. Journal of Materials Chemistry C. 2 (29), 5818-5828.
  5. Guedes, A., Murray, R.C., Ribeiro, H., Rodrigues, A., Valentim, B., Sant’Ovaia, H., Noronha, F., 2013. Integration of different sediment characteristics to discriminate between sources of coastal sediments. In: Duncan Pirrie, Alastair Ruffell and Lorna Dawson (eds). Environmental and Criminal Forensics. Geological Society, London, Special Publications, 384. P. 97-108.
  6. Guedes, A., Murray, R.C., Ribeiro, H., Sant’Ovaia, H., Valentim, B., Rodrigues, A., Leal, S., Noronha, F. 2013. The Potential Application of Magnetic Susceptibility as a Technique for Soil Forensic Examinations. In: Pirrie, D., Ruffell, A. & Dawson, L. A. (eds) Environmental and Criminal Geoforensics. Geological Society, London, Special Publications, 384, p.65-73.
  7. Carvalho, A., Ribeiro, H., Guedes, A., Abreu, I., Noronha, F. 2013. Application of Geology and Palynology in the characterization of a river beach (Portugal) for forensic purposes. In: Pirrie, D., Ruffell, A. & Dawson, L. D. (eds) Environmental and Criminal Forensics. Geological Society, London, Special Publications, 384, 87-95.
  8. Guedes, A., Algarra, M., Prieto, A.C., Valentim, B., Hortelano, V. Neto, S., Algarra, R., Noronha, F. 2013. Raman Microspectroscopy of Genuine and Fake Euro Banknotes.Spectroscopy Letters. 46:8, 569-576.
  9. Fernández-González, M., Guedes, A., Abreu, I., Rodríguez-Rajo, F.J. 2013. Pla a_1 aeroallergen immunodetection related to the airborne Platanus pollen content. Science of the Total Environment. 463–464, 855–860.
  10. Carvalho A., Ribeiro. H, Mayes, B., Guedes, A., Abreu, I., Noronha, F., Dawson, L. 2013.Organic Matter Characterization of Sediments in Two River Beaches from Northern Portugal for Forensic Application. Forensic Science International. 233, 403–415.
  11. Prieto, A.C., Martínez, O., Souto, J., Avella, M., Guedes, A. 2013. Study of a tabernacle with a remarkable architectural structure: in situ examination using Raman spectroscopy. Journal of Raman Spectroscopy. 44, 1156–1162. DOI: 10.1002/jrs.4346.
  12. Mota, D.A., HemaChandra, G., Ventura, J. Guedes, A., Pérez de la Cruz J.2013. Influence of Process Parameters on the RF Sputtered GaP Thin Films, Journal of Materials Science & Technology, 29(9), 821-829.
  13. Guedes, A., Algarra, M., Prieto, A.C., Valentim, B., Hortelano, V. Neto, S., Algarra, R., Noronha, F. 2013. Raman Microspectroscopy of Genuine and Fake Euro Banknotes. Spectroscopy Letters.46:8, 569-576.
  14. Valentim, B., Hower, J.C., O’Keefe, J.M.K., Rodrigues, S., Ribeiro, J., Guedes, A., 2013. Notes on the origin of altered macerals in the Ragged Edge of the Pennsylvanian (Asturian) Herrin coalbed, Western Kentucky. International Journal of Coal Geology 115, 24-40.
  15. Queirós, R. B., Guedes, A., Noronha, J.P., Marques P.V.S., Sales M.G. F. 2013. Recycling old screen-printed electrodes with newly designed plastic antibodies on the wall of carbon nanotubes as sensory element for in-situ detection of bacterial toxins in water. Sensors and Actuators B: Chemical.
  16. Valentim, B., Algarra, M., Guedes, A., Rodriguez-Borges, J. E., Esteves da Silva, J.C.G., Suárez-Ruiz. I. 2013. Coal Rank Increase and Aerial Oxidation by a Combination of Fourier Transform Infrared Spectroscopy with Multivariate Analysis. Spectroscopy Letters,46:4, 277-285.
  17. Valentim, B., Rodrigues, S., Ribeiro, S., Pereira, G, Guedes, A., Suárez-Ruiz I. 2013. Relationships between the optical properties of coal macerals and the chars resulting from fluidized bed pyrolysis. International Journal of Coal Geology. 111, 80–89.
  18. Guedes, A., Prieto, A.C. 2012. Raman spectroscopy for the characterization of inks on written documents.In: Chalmers, J.M., Edwards, H.G.M., Hargreaves, M.D., eds. Infrared and Raman Spectroscopy in Forensic Science. John Wiley & Sons, Chichester , UK. p. 137-151.
  19. Guedes, A., Valentim, B., Prieto, A.C., Noronha, F., 2012. Raman spectroscopy of coal macerals and fluidized bed char morphotypes. Fuel 97, 443-449 DOI:10.1016/j.fuel.2012.02.054.
  20. Pereira, C., Pereira A.M., Fernandes, C., Rocha, M., Mendes, R., Fernández-García, M.P., Guedes, A., Tavares, P.B., Grenèche, J.-M. Araújo, J.P., Freire, C. 2012. Superparamagnetic MFe2O4 (M = Fe, Co, Mn) Nanoparticles: Tuning the Particle Size and Magnetic Properties through a Novel One-Step Coprecipitation Route. ChemistryofMaterials. 24, 1496−1504.
  21. Silva, L.F.O., Sampaio, C.H., Guedes, A., Fdez-Ortiz Vallejuelo, S., Madariaga, J.M., 2012. Multianalytical approaches to the characterisation of minerals associated with coals and the diagnosis of their potential risk by using combined instrumental microspectroscopic techniques and thermodynamic speciation. Fuel 94. 52-63.
  22. Prieto, A.C., Guedes, A., Dória, A., Noronha, F., Jiménez, J., 2012. Quantitative determination of gaseous phase compositions in fluid inclusions by Raman microspectrometry. Spectroscopy Letters 45, 156-160.
  23. Guedes, A., Ribeiro, H., Valentim, B., Rodrigues, A., Sant’Ovaia, H., Abreu, I., Noronha, F., 2011. Characterization of soils from the Algarve region (Portugal): a multidisciplinary approach for forensic applications. Science and Justice 51, 77-82. DOI:10.1016/j.scijus.2010.10.006.
  24. Bento dos Santos, T., Munhá, J., Tassinari, C., Noronha, F., Guedes, A., Fonseca, P., Dias Neto, C., Dória, A., 2011. P-T-Fluid evolution and graphite deposition during retrograde metamorphism in Ribeira Fold Belt, SE Brazil: oxygen fugacity, fluid inclusions and C-O-H isotopic evidence. Journal of South American Earth Sciences 31, 1, p. 93-109.
  25. Valentim, B., Guedes, A., Boavida, D., 2011. Nitrogen functionality in oil window rank range vitrinite-rich coals and chars. Organic Geochemistry 42, 502-509.
  26. Valentim, B., Guedes, A., Rodrigues, S., Flores, D., 2011. Case study of igneous intrusion effects on coal nitrogen functionalities. International Journal of Coal Geology 86, 2-3, 291-294.
  27. Guedes, A., Valentim, B., Prieto, A.C., Rodrigues, S., Noronha, F. 2010. Micro-Raman spectroscopy of collotelinite, fusinite and macrinite. International Journal of Coal Geology 83, 415–422. DOI:10.1016/j.coal.2010.06.002.
  28. Guedes. A., Ribeiro, H., Valentim, B., Noronha, F. 2009. Quantitative colour analysis of beach and dune sediments for forensic applications: a Portuguese example. Forensic Science International. 190. 42–51.
  29. Guedes. A., Ribeiro, N., Ribeiro, H., Oliveira, M., Noronha, F., Abreu, I. 2009. Comparison between urban and rural pollen of Chenopodiumalba and characterization of adhered pollutant aerosol particles. Journal of Aerosol Science, 40: 81-86.
  30. Charef, A., Guedes, A., Noronha, F., Sousa, M., 2009. Fossil and present-day hydrothermal fluids from North Tunisia: an example of a dynamic fluid evolution. Cadernos Lab. Xeolóxico de Laxe, 34, 43–58.
  31. Valentim, B., Hower, J.C., Soares, S., Guedes, A., Garcia, C., Flores, D., Oliveira, A., 2009. Petrographic characterization of the Economizer fly ash. Minerals and Metallurgical Processing Vol. 26, No. 4, 174-182.
  32. Marques, M., Suárez-Ruiz, I., Flores, D., Guedes, A., Rodrigues, S., 2009. Correlation between optical, chemical and micro-structural parameters in high-rank coals and graphite. International Journal of Coal Geology 77, 3-4, 377-382.
  33. Valentim, B., Guedes, A., Flores, D., Ward, C.R., Hower, J.C., 2009. Variations in fly ash composition with sampling location: Case study from a Portuguese power plant. Coal Combustion and Gasification Products 1, 1-11.
  34. Valentim, B., Hower, J.C., Guedes, A., Flores, D., 2009. SEM/EDS of low-sulphur coal fly ash. International Journal of Energy for a Clean Environment 10(1-4), 147-166. DOI: 10.1615/InterJEnerCleanEnv.2011001526.
  35. Guedes, A., Valentim, B., Prieto, A.C., Sanz, A, Flores, D. & Noronha, F. 2008. Characterization of fly ash from a power plant and surroundings by micro-Raman spectroscopy. International Journal of Coal Geology, 73: 359–370.
  36. Valentim, B, Hower, J.C., Flores, D., Guedes, A., 2008. Notes on the efficacy of wet versus dry screening of fly ash. Minerals and Metallurgical Processing. 25, 3: 143-148.
  37. Guedes, A., Noronha, F., Prieto, C., 2005. Characterisation of dispersed organic matter from lower Palaeozoic metasedimentary rocks by Organic Petrography, X-ray diffraction and Micro-Raman spectroscopy analyses. International Journal of Coal Geology, 62, 237-249.
  38. Prieto, A.C., Guedes, A., Dória, A., Noronha, F., 2005. Characterization of pigments in a limestone sculpture “Las tresgeneraciones” (Cathedral’s Museum of Santiago de Compostela, Spain) by Optical Microscopy and Micro-Raman Spectroscopy. Canadian Journal of Analytical Sciences and Spectroscopy, 50, 2, 59-68.
  39. Guedes, A., Noronha, F., Boiron, M.C., Banks, D., 2002. Evolution of fluids associated with metasedimentary sequences from Chaves - North Portugal. Chemical Geology, 190, 1-4, 273-289.
  40. Noronha, F., Cathelineau, M., Boiron, M.C., Banks, D.A., Dória, A., Ribeiro, M.A., Nogueira, P., Guedes, A., 2000. A three-stage fluid flow model for Variscan gold metallogenesis in northern Portugal. Journal of Geochemical Exploration 71, 209-224.

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